Potassium octachlorodimolybdate
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Potassium octachlorodimolybdate
| Potassium octachlorodimolybdate | |
|---|---|
| Properties | |
| Molecular formula | Cl8K4Mo2 |
| Molar mass | 631.9 g/mol |
| Appearance | red crystals |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
|
| Infobox references | |
Potassium octachlorodimolybdate is the inorganic compound with the formula K4Mo2Cl8. This red-coloured salt consists of potassium cations and the octachlorodimolybdate anion, Mo2Cl84−. The anion is of historic interest because it was one of the earliest illustrations of a quadruple bonding. The salt is usually obtained as the dihydrate.
The compound is prepared in two steps from molybdenum hexacarbonyl:[1][2]
- 2 Mo(CO)6 + 4 HO2CCH3 → Mo2(O2CCH3)4 + 2 H2 + 12 CO
- Mo2(O2CCH3)4 + 4 HCl + 4 KCl → K4Mo2Cl8 + 4 HO2CCH3
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The reaction of the acetate with HCl was first described as providing trimolybdenum compounds,[3] but subsequent crystallographic analysis confirmed that the product contains the Mo2Cl84− ion with D4h symmetry. The Mo---Mo distance is 2.14 Å.[4]
References
- ^ A. B. Brignole, F. A. Cotton, Z. Dori (1972). Rhenium and Molybdenum Compounds Containing Quadruple Bonds. "Inorganic Syntheses". Inorg. Synth.. Inorganic Syntheses 13: 81–89. doi:10.1002/9780470132449.ch15. ISBN 978-0-470-13244-9.
- ^ Girolami, G. S.; Rauchfuss, T. B. and Angelici, R. J. (1999). Synthesis and Technique in Inorganic Chemistry. Mill Valley, CA: University Science Books. ISBN 0-935702-48-2.
- ^ G.B. Allison, I.R. Anderson, and J.C. Sheldon (1967). "The Preparation of Halogenotrimolybdate(II) Compounds". Australian Journal of Chemistry 20 (5): 869–876. doi:10.1071/CH9670869.
- ^ Jurij V. Brencic and F. Albert Cotton (1969). ""Octachlorodimolybdate(II) Ion. Species with a Quadruple Metal-Metal Bond". Inorg. Chem. 8: 7–10. doi:10.1021/ic50071a002.
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